Extrusion for a fence system



FIG. 1 is a front perspective view of the extrusion for the fence system in accordance with the present design;

FIG. 2 is a right side elevational view of the design of FIG. 1;

FIG. 3 is a left side elevational view of the design of FIG. 1;

FIG. 4 is a top plan view of the design of FIG. 1;

FIG. 5 is a is a bottom plan view of the design of FIG. 1;

FIG. 6 is a front elevational view of the design of FIG. 1;and

FIG. 7 is a rear elevational view of the design of FIG. 1. 

The ornamental design for an extrusion for a fence system, as shown and described. 